This advisory also applies to the corresponding versions ofKubuntu, Edubuntu, and Xubuntu.

The problem can be corrected by upgrading your system to thefollowing package versions:

Ubuntu 5.04: libksba8 0.9.9-2ubuntu0.5.04

After a standard system upgrade you need to restart your session toeffect the necessary changes.

Details follow:

A parsing failure was discovered in the handling of X.509 certificates that contained extra trailing data. Malformed or malicious certificatescould cause services using libksba to crash, potentially creating a denial of service.